California - Criteria: C (architecture/engineering)
| McCullagh-Jones House |
| McDonald, D. C., Building |
| McDonald Mansion |
| McElroy Octagon House |
| McFarlan, George, House |
| McHenry Mansion |
| McKinley Park |
| McMullen, John, House |
| McNear, Erskine, B., House |
| Medico-Dental Building |
| Meek Mansion and Carriage House |
| Mello, Clarence and Mary, House |
| Melrose Baptist Church |
| Memorial Branch |
| Mendocino and Headlands Historic District |
| Menlo Avenue-West Twenty-ninth Street Historic District |
| Menlo Park Railroad Station |
| Mentor Court |
| Merced County Courthouse |
| Merced County High School |
| Merced Grove Ranger Station |
| Merced Lake Ranger Station |
| Merced Theatre |
| Merchants National Bank of Sacramento |
| Merrill, Charles W., House |
| Merrill, Samuel, House |
| Merritt, Josiah, Adobe |
| Merrium Apartments |
| Merwin House |
| Mesick House |
| Messina Orchard |
| Methodist Episcopal Church at Half Moon Bay |
| Methodist Episcopal Church of Pescadero |
| Meux House |
| Middough Brothers-Insurance Exchange Building |
| Migliavacca House |
| Milano Hotel |
| Millard House |
| Miller and Herriott House |
| Miller-Melone Ranch |
| Miller, Warren P., House |
| Milliken Creek Bridge |
| Million Dollar Theater |
| Mills Building and Tower |
| Mills Hall |
| Milpitas Grammar School |
| Miltimore House |
| Mineral King Road Cultural Landscape |
| Minerva Club of Santa Maria |
| Minter, George W., House |
| Mish House |
| Mission Beach Roller Coaster |
| Mission Brewery |
| Mission Court |
| Mission Dolores |
| Mission Inn |
| Mission San Fernando Rey de Convento Building |
| Mission San Juan Capistrano |
| Mission San Miguel Arcangel |
| Mission Santa Ines |
| Modjeska House |
| Mohnike Adobe |
| Mohr and Yoerk Market |
| Moir Building |
| Molino Lodge Building |
| Monday Club of San Luis Obispo |
| Moneta Branch |
| Mono County Courthouse |
| Montecito Apartments |
| Montecito Ranch House |
| Monterey County Court House |
| Monterey Old Town Historic District |
| Mooers, Frederick Mitchell, House |
| Moraga Adobe |
| Moro Rock Stairway |
| Morro Bay State Park Trailer and Tent Campground |
| Morse, Charles Copeland, House |
| Moss Flats Building |
| Mountain Quarries Bridge |
| Mountain View Adobe |
| Mount Harkness Fire Lookout |
| Mount Lowe Railway |
| Mount Pleasant House |
| Mount San Jacinto State Park Historic District |
| Mount Tamalpais Mountain Theater |
| Mount View Hotel |
| Moylan, Maj. Myles, House |
| Muckenthaler House |
| Muir, John, Branch |
| Muir, John, Memorial Shelter |
| Muir Woods National Monument |
| Murphy, D. J., House |
| Murphys Grammar School |
| M.V. SANTA ROSA |
| Myrtle Street Flats |
| Napa County Courthouse Plaza |
| Napa River Bridge on Zinfandel Lane |
| National Bank of San Mateo |
| National Bank of Whittier Building |
| National Carbon Company Building |
Data from United States Park Service and Wikidata
